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Presentation on theme: "Service Delivery 3 Hydraulics. Aim To ensure students can explain the principles of obtaining and delivering water."— Presentation transcript:

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Aim To ensure students can explain the principles of obtaining and delivering water.

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Learning Outcomes At the end of the session students will be able to: Understand the relationship between atmospheric pressure and suction lift Describe the principal characteristics of pressure Describe how friction causes pressure loss Explain the term ‘jet reaction’ Carry out basic fireground calculations.

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Theoretical lift Approximately 10 metres - assuming a perfect vacuum can be created and the water is cool and pure.

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Pressure and head The height to which water is lifted or pumped is referred to as the head To raise a column of water 1 metre in height requires a pressure of 0.1bar. This applies to both ‘suction head’ and ‘delivery head’.

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Factors limiting suction lift Lifting water from it’s existing level to the pump inlet Overcoming frictional resistance to the water Turbulence at the pump eye Creation of flow.

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Practical lift Because of these factors the maximum practical suction lift is generally regarded as 8 metres.

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Confirmation Assessments will be based on this lesson and the corresponding study note Learning Outcomes Understand the relationship between atmospheric pressure and suction lift Describe the principal characteristics of pressure Describe how friction causes pressure loss Explain the term ‘jet reaction’ Carry out basic fireground calculations.